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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <localeinfo.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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/* Compare S1 and S2, returning less than, equal to or
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greater than zero if the collated form of S1 is lexiographically
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less than, equal to or greater than the collated form of S2. */
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int
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DEFUN(strcoll, (s1, s2), CONST char *s1 AND CONST char *s2)
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{
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if (_collate_info == NULL || _collate_info->values == NULL)
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return strcmp(s1, s2);
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else
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{
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CONST unsigned char *CONST values = _collate_info->values;
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CONST unsigned char *CONST offsets = _collate_info->offsets;
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while (*s1 != '\0' && *s2 != '\0')
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{
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CONST unsigned char c1 = *s1++, c2 = *s2++;
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CONST unsigned char v1 = values[c1], v2 = values[c2];
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CONST unsigned char o1 = offsets[c1], o2 = offsets[c2];
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if (v1 == UCHAR_MAX && o1 == 0)
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/* This is a non-collating element. Skip it. */
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--s2;
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else if (v2 == UCHAR_MAX && o2 == 0)
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--s1;
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else if (v1 == UCHAR_MAX && o1 == CHAR_MAX)
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{
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/* This element collates lower than anything else. */
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if (v2 != UCHAR_MAX || o2 != CHAR_MAX)
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return -1;
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}
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else if (v2 == UCHAR_MAX && o2 == CHAR_MAX)
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return 1;
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else if (v1 != v2)
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return v1 - v2;
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else if (o1 != o2)
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return o1 - o2;
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}
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if (*s1 == '\0')
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return *s2 == '\0' ? 0 : -1;
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else if (*s2 == '\0')
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return 1;
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return 0;
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}
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}
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